LM2735YSDEVAL

User's Guide SNVA257A – June 2007 – Revised April 2013 AN-1660 LM2735Y 6-Pin WSON Demo Board 1 Introduction This demo board converts 3V to 5.5V input to 12V output for up to 500mA load current using the LM2735Y 520kHz DC-DC switching converter. This is a 2-layer board using the bottom layer as a Ground plane. A bill of materials describes the parts used on this demo board. A schematic and layout have also been included, along with measured performance characteristics. The above restrictions for the input voltage are valid only for the demo board as shipped with the demo board schematic shown in Figure 1. 2 Operating Conditions • • • VIN = 3V to 5.5V VO = 12V IO = 500mA VIN L1 C1 C5 1 6 2 5 3 4 R1 VO D1 R2 C2 C3 C4 R3 Figure 1. LM2735Y 6-Pin WSON Schematic All trademarks are the property of their respective owners. SNVA257A – June 2007 – Revised April 2013 Submit Documentation Feedback AN-1660 LM2735Y 6-Pin WSON Demo Board Copyright © 2007–2013, Texas Instruments Incorporated 1 Pin Description for 6-Pin WSON 3 www.ti.com Pin Description for 6-Pin WSON PGND 1 6 SW VIN 2 5 AGND EN 3 4 FB Figure 2. Pin-Out Table 1. Pin Description 4 Pin Name Function 1 PGND Power ground pin. Place PGND and output capacitor GND close together. 2 VIN Supply voltage for power stage, and Input supply voltage. 3 EN Shutdown control input. Logic high enables operation. Do not allow this pin to float or be greater than VIN + 0.3V. 4 FB Feedback pin. Connect FB to external resistor divider to set output voltage. 5 AGND 6 SW DAP GND Signal ground pin. Place the bottom resistor of the feedback network as close as possible to pin 5 Output switch. Connect to the inductor, output diode. Signal & Power ground. Connect to pin 1 & pin 5 on top layer. Place 4-6 via’s from DAP to bottom layer GND plane. Bill of Materials Table 2. Bill of Materials 2 Part ID Part Value Manufacturer U1 2.1A Boost Regulator Texas Instruments LM2735 C1 Input Cap 22µF, 6.3V, X5R TDK C2012X5R0J226M TDK C3216X5R1E106M C1608X5R1H331K C5 Input Cap No Load C3 Output Cap 10µF, 25V, X5R C4 Output Cap No Load Part Number C2 Comp Cap 330pF TDK D1, Catch Diode 0.4Vf Schottky 1A, 20VR ST STPS120M L1 22µH 2.3A Coilcraft DO3316P-223 R3 10.2kΩ, 1% Vishay CRCW06031022F R2 86.6kΩ, 1% Vishay CRCW06038662F R1 100kΩ, 1% Vishay CRCW06031003F AN-1660 LM2735Y 6-Pin WSON Demo Board Copyright © 2007–2013, Texas Instruments Incorporated SNVA257A – June 2007 – Revised April 2013 Submit Documentation Feedback LM2735Y η vs Load Current, VO = 12V www.ti.com 5 LM2735Y η vs Load Current, VO = 12V Figure 3. LM2735Y η vs Load Current, VO = 12V SNVA257A – June 2007 – Revised April 2013 Submit Documentation Feedback AN-1660 LM2735Y 6-Pin WSON Demo Board Copyright © 2007–2013, Texas Instruments Incorporated 3 PCB Layout 6 www.ti.com PCB Layout Figure 4. Top Layer Figure 5. Bottom Layer 4 AN-1660 LM2735Y 6-Pin WSON Demo Board Copyright © 2007–2013, Texas Instruments Incorporated SNVA257A – June 2007 – Revised April 2013 Submit Documentation Feedback IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms and conditions of sale of semiconductor products. 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